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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee71b62a81db2c8af864d47d06bb707071fbf47fe1dd5c4fab9d480eb129cf0' 
  AND token = '5xamcHIZvtEP3Dzowq16Zym5c8uy7qVmUAdZcKRbZzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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