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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7cb93634da50c2991bdd1ab5231b790730c601df2215676ca4524127adab07' 
  AND token = 'satDfqUBL3TCFi4za3f/yjF/gpLE4915TEJKw6ErbH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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