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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bf3d29fad1ae7fc03ad42c80caec6e1a0506e441ab9f1b44436ee9f498aabe' 
  AND token = '/LIiF7erF5qrQ/PQM9aV2KRShkfgqfon+82aYZJryL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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