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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5caf35c800d8a46ca4250ae4c4dc6d02d7be812cec6d06b33c3e54c92165a3b' 
  AND token = 'fR1SO8LLiDujfKXlpuHnv5StRboRwd4b9jjxrIwbPm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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