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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1842f53945efd781f704a2bb0a94b39e30f1685b963ba41136e90673bfee65' 
  AND token = 'ui7EHnfkMAgCCVQcdteNAydlqx9O5du2FNLVDL0of8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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