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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588c3734d4ec2cf224e81667341ca2a9678bba82bd150c2b32e998c55de3e1d7' 
  AND token = '4m+qGOxkox248tuiVGZ6+XByubSVSeWESGIIJx6VX4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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