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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca9f144844d37603be72c12127756784e96506b5291e15fb5cad3db10246f29' 
  AND token = 'pYFiCLRfPwcqfdXkb5bK8o+P1lXm0hfLN6dfBphk3ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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