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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb005117f6034373184d537f8c7a4acc1c03ed3a5a84ae57454a845055ad9ba6' 
  AND token = 'NoEBVu6uBz93dE661Hqu9wf7iIT80b82SKh6fIO4o4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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