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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a003fb50f6edda732762dc0f3a8955ff008c1dea89593a1a44fefb34afab429' 
  AND token = 'VJmNPnA4GudznNzJoEEfgn+VX8rrkO0mhN1sveG8QNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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