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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f92d7e92d9bf7a5814f47d36ce9701dd5d5b892f37cc78dcf49330828d8f92' 
  AND token = 'BPh6kbgHaj7KfVa7IeFS3xGNY+DiQNJ4Dk6ouYiLJNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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