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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6763c0fb7546a844a75f3e3d43a1ad414e220dcf1bccabf7b14409232fee57b' 
  AND token = 'qHTiSyof1MLDiTq7dQGs9qG1HsNe+rV31hSydXcwpfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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