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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfe465916c5ca9752606f2ea1f383be38996ae2be1d63fccd40f4aec6769162' 
  AND token = '3ScVSP7ytSZbXpApRXSJf59vIEcFA8s0B2Ir3Lmfg1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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