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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2e749ba0e1b5f85dfd2a19b84568e0f325fe457b0d62549b0799268114c21f' 
  AND token = 'j8+naqCON/Waw1aUfNU1PwDwIjGy3I9oazangd1cHpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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