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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b95beb8154fdca0466e91fd7520be320e0d703ac0649a93da2659eac363343d' 
  AND token = 'jMaGN+VRE4b5XtlK+GgG5Fj4hOcGvh3FEs5dUy6p5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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