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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf861354f676ca70274c4ba5a8b0b4247057caf3e842ef42975fc590ee648de3' 
  AND token = '+CqvT+Q6AZxJgXDnxFUb/L/HceIaQ16CQQ9Dw/Z3lrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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