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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96557265ed20ae05965ef1e95ff21636038a9b6afa3a80d95b1f4fbaea72f687' 
  AND token = 'c1DAw5jEeAlbsOh08Gd763fCK0LxKlhud2n9Kg2oPRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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