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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56daceaf53f46a69808d6eb89086a579d2b9123b7776da413eb786affb5ea16c' 
  AND token = 'Ntss/PCC16oeAE4Tn+68SmmPBdzcMnY99ugHCM1aAxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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