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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7891e19dc7a5465fcd3dd003275d91cdf0972d64ff2f28e1069376f1e69c01ad' 
  AND token = 'CLxRQOeKnmXbeN9mns81dqthWoGlDUbU5lrEe4HolUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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