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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc682d946d90c82d02eb44bde84f992dabc21b2a4e01204b29b2e602286fcb7' 
  AND token = 'gbLGfDKDAoGWq8Kh8SQwrxBpasTsTx1EXrRaf51jQgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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