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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba14323943fe09e47f0469d7df28b438530c0c05a4a874fca210e070c4061dd' 
  AND token = 'wnigO4z0hhFSBtJwk95saD+Xad7OP6/Q/9abQDth4iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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