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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df0adcee8acf07140a5b16aaebef6823fcf925b20d033bc727993acbdb6526a' 
  AND token = 'GzTCsoIPB17ne50w4fQi3Ug2wRNT7jxyooN1K/0PnRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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