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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec2ae9128b8f9c33c22c0b3b6aef4e37ae988d69aa6184f732bbe23ac2959b9' 
  AND token = '9Dpu5Z4WfkENqbmwVjNN+Bjgtnkw97PvoQyRCZ2AdCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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