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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb3a7609d2e10e93d1290e565eeee6a0e1130b7e3d3ccef3caa460f53954ce5' 
  AND token = 'oB0hAsaVmuz/Wrdu0j/F8YNRJFbb+v26OtIlfXXH2kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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