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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5499e9c26e89826ee14f0b79d482deae2bbbd623a94262ceda6a1843b15f8e' 
  AND token = 'hlMQ/eDhgohFXhRbIkj8mhYGdwIbtRaserXc9GIzNOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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