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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7e2a7afbde6bd8e74846432a2ccadeb095254d83fc8804b719aff507047e9b' 
  AND token = 'lsUIaNE8nIunbWaYdZJXYGw3wTWGye7uUSJKoSuATDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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