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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f029bae7519c2bebb0959aab887bf115ed593971e8821656c1e8dd8a32d2bf8' 
  AND token = 'X9xyuFJ1wqxnfcnk/y3Ge/pXc1Linr2o1zbfZOOmWg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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