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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29be18f3cf792b1141cd0b932e90e73b61e3c0528c0db202c572854813a3f0b' 
  AND token = 'KmfgLObFfZ293EY+4U5Rmqsxi6MR8eMTcHoayZu4e9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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