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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597e6c6bddab46b50b223fe44494d1cecc463cd34bb4259fa93b0d6b37dd5ae9' 
  AND token = 'Xy0QpslYm2hYDGoZA2ixK5XbJBNy4sTgg0OEJu/v/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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