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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30abd42ccbf66f7ad7e53c9cafc5f4527ee3e0a869000dc0121158c5a88534e' 
  AND token = 'LDHMZLi2qAxC9eAEfJu2LMxflAjCEmLYuuqsazVJ1h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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