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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a2d54428a0a89b6272db09939657f943d801a7a80d2af1453e14b6cff3bd98' 
  AND token = '0jzklHCQ326fdNW0kEGa05UQ89a7VaiZ8pJ9MxgwdOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00146

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}