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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbe91c8c4ec7b84451faaeea77002d38b455b99c40dac0992f57a3ccb354d3c' 
  AND token = 'MAh9VK7qfJSayxTRLmt4gHH9bf1tTagg3o3jut3MMsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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