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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b28c7dfad2231fb9fc485f4cf57bbb0e7f7c5c90830ca26ffe06a47f7379828' 
  AND token = 'UynKXZxG8zyvGJOH7Z0i5PNU2cLS5+d7yDncCAnWmtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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