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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf8bd971d6a268ca23197970f33855a485d58c146f314323385e24500410fa0' 
  AND token = '1JiuLEN9wnp1v06w/ZGA01NuHeGqMvd9+OxEDRHHL7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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