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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbe14cb0517f2ee628d7fc3e1388a0262e95541029bc2ef39cf1bb1e4ae4851' 
  AND token = '2Rl3Ef2Iv+OVs1UJI3Hcgmo5ubk3Q17dksf0pfolC8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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