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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39108c6c6ccc4fb3ec09bb6ec2e86e637a5d21627febf8aab135d88aa81c80a' 
  AND token = '0et+YA4OTrb7+3iQjjPqaZGAITR7eWQQYTkE9NFUXo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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