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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad25b5ef1c4429887d5fa1ab4cba3e599f6ed337df7240fd00f7355df59d2e56' 
  AND token = 'MprSE1f2z6watfWwlnQrHjCz0d2onb9Xc5APKYTQSjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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