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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842ba1e47c3715f6ad06d8fd9d91a39d4bee556d8296e1845c890ce8de07787c' 
  AND token = 'L7oi/Ucg4XnRIVRuRKSQ4ytFnKXiEGtLkRlC2AytRik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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