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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c18da41763e630ed3e2f687657af9d19a5a4c33774acfca93a5caf3269b07ae' 
  AND token = '5n8kHqQzQHUoaYBJxr+QwdYScbYpZFg5TJq1n3EBgoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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