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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365e83606497c9c459def5e31faeee6fef2b2f688612bd4a8add87a2ef6c5577' 
  AND token = 'fSNwC9ToJjlE2QbL1MxHAIKEw0ZXB1kVtQMB5EkUWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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