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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932e49fc9af7861dbf9140c9b1be64e070a11c64797c5d9c4901df1e19120239' 
  AND token = 'AzlwZrH7/GR90Ifes9rDjMpZpAU/3opp1orSf8nz+xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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