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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f4f39bb50981ab45987ee00e2e6effc0635f657edae6c03e4c01397ebb7b6a' 
  AND token = 'vZKL+WL0ve1uS7UVsKrjJ08gr5NGUukenVbran5qCTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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