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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8e7d4992ac9034c748ec6273773f9baa46c2edfc794be9d4fe2acd902cdd0b' 
  AND token = 'zYyCLf6D1a1Ltx+Pzr4qMBypVqAACNGtQiR9wpr67g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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