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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8488e6782e10d5f459adf91ae9a756d4e32f00af2df91e736d50bd2d5e402eb' 
  AND token = '9kX94iylY6Dmkl27Qek9yn4Ps3olEaw/qIFWNr7ia20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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