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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991886e0c8bb981df0dc48c6f9ad8c0858319918c7f12254c74eee462f70f95c' 
  AND token = 'bTMWYvU2gcSq03llNNEbqA6od5OAXrZbAXcR/ftrVCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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