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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71156cea7bcd7f6a1dac012a76cbe039f63fb0919586cac392ff0aeebc1aa92d' 
  AND token = 'RmXx6Nnu01ifmAtQ4aVGPArAZ/t4UDA40MiSKhq86os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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