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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b75b6a103600b734fd6cb0cb76aa2d6ef63f5f7b6813a82885b2e821d9c6c1' 
  AND token = '0sK8wWPE1PFvdmz08sDMjCjXS9wKbKRcenrtT295Zlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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