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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68dad79d2f5d0cdcd7c9ffdebf5f6a444fb5f1a2c165aaabee58365c8947a34' 
  AND token = '0reaAzOZk4Ba7RtYiOP+Pj7q9o4xgB+l/G15Acwg7jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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