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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addd1b99568ab583597516845bf0c11890f9bcc0105984fb3c267b4a2751fba4' 
  AND token = 'eSzYrR6GXCElWSBVyI1G2jA7J/Xp0seEioBgrr0ozTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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