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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ddee4661432574988a92516046e8fb1824c00dee1c515ba7cbc679425a7b89' 
  AND token = '/f1oRfP2dB1s9Zj/m0fNqrEhSl7oarEa4JbzDQu3wYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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