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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fc7b817a790b9a6e91e3fb718e2c7bf5d2a8bef8c5a0a1f7263b40850ed489' 
  AND token = 'rCOtHx64xgzGY9yYJ7t3/SG4ETZ8RLDHUn+M8Oz6c2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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