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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2cefbb0c186d1c7d7987045edc14b53470fe4fb3d7b9e5688cbf330cb0ec02' 
  AND token = 'wIZPsGMsN3MG/btHeEJjVJP2Ycn9SnaJ9lAedN84iQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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