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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fd71e7be99e2ec22d4bd6870c888acd3d94202cd150d9b51d199933eb7e879' 
  AND token = 'IAZ/sBvRs3am2/5EccnwqC+U3xmhqdsxhWBJ4+U2Onc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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