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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e714ff0ffab8a9f4ee71f4853df0826d2f4b54d8e11f042e8bfcc3a00cc91e' 
  AND token = '9XNUywfzV6q3BnqTpWssIr9MDum0ADjJmwDH9EHHt7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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