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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fbb81606f3bd8f391f7b9d5263905e33a1b5e957ac7eb2c69b1488370a5b6b' 
  AND token = 'WSNaH5uKlIzn9NM1J8nRbanJLfQfFjfK/saJxDUCCyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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