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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1cc3c929fb01574ed3647edd66af8005835e815ed47d7f69642eddc8e05617' 
  AND token = 'cwltvkSWcpWpeB6m7JdQ8BRm++0gi8d15A0WkFy90iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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