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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e555819853d1129d3487b26bf5223923a34ce87261a86c475455ea0a336111d6' 
  AND token = 'PLab1bynBMTzHyoK3vSsznayWzSTyF5v4k37P3fc1+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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