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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d25e60f2f565be915feafae02442c24e322193c94e103ecb3b64b9c61153700' 
  AND token = '3pekqUKH9tiCfHDQbQN65+rZur+H2g8spBWQ45EFoeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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