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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d9c11efc09989f4c837ad600625d2e5740d5cc5e6535e6d15949ddaa19e9da' 
  AND token = 't2nw22niU78ka8pkcDW00VV2Hgxzht/VuYhU4cQvFAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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