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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812ec5966a94b9b2c88ffc4c84eba7935311cac3942049ffc3c798f7f7f4512d' 
  AND token = 'WRxKS8nBN3YLe1F3tht9ObG8Xveb84pVQ5TiazXKvhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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