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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba09c22e8b6fba7a96778f6f5ffcb266341ff905abef2d28cfd21c092c6992e4' 
  AND token = '245kAFRpFlvgwWV8f2SFhVY7BCUAg4upU8MvOEHv5PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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