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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff974870dedc20ba8ae0766b368017b63c2d08f7ba741002f4b87e9836dc2228' 
  AND token = 'Khq8jLdmBvTuoNa2U7xZmr2OqtNPTe95VfRlOPpDf7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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