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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de15b5da83415717ae6c642711883e2b58ff4619aabd29f336d055b9ed19aa3' 
  AND token = 'OSmjEdlcNGIdKj7b5hIOEvjzTfuSsTeqSkT/wpp6wLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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