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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55e4c98f8d510888928759251949b47b28152c2e34cfff4dae6fdc6e972574f' 
  AND token = '0nEnFjAmXF4KBawBoB8+/CphKURP192Cn4+uuRoL3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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